Swan Song, I can relate. I actually confronted one person who copied my art (it was not a quilt) and she blew me off saying I had "inspired" her. Imitation is not always flattery, especially when the work is taken out of context. If you see that your work is being used inappropriately, follow up on it, but most people will play dumb and say they didn't know
Some people would never walk into a store and take stuff without paying, but think it is just fine to help to anything they see online. Then, they are cluelsss about who or where designs come from. As if that isn't enough, they pass the designs on to others without attribution, or post as if it was their own work.